From: Julian Elischer <jul...@whistle.com> Subject: Re: Rewriting pca(4) using finetimer(9) (was: Re: MPU401 now works under New Midi Driver Framework with a Fine Timer) Date: Thu, 8 Jul 1999 11:23:42 -0700 (PDT) Message-ID: <pine.bsf.3.95.990708112244.25198c-100...@current1.whistle.com>
julian> this is problematic. julian> you cannot add a new element before the pending firing because you can't julian> tell how far into the present trigger you are. The workaround below would help it. The time elapsed since the last aquire_timer0() can be determined by latching the timer counter. From: Seigo Tanimura <tanim...@naklab.dnj.ynu.ac.jp> Subject: Re: Rewriting pca(4) using finetimer(9) (was: Re: MPU401 now worksunder New Midi Driver Framework with a Fine Timer) Date: Thu, 08 Jul 1999 18:40:23 +0900 Message-ID: <199907080940.saa26...@rina.naklab.dnj.ynu.ac.jp> tanimura> > t' > \sum_(k=0)^(j) dt_rem(c_k) tanimura> > tanimura> > where the right hand side of the inequality is the time span after which tanimura> > the callout c_k is made. Then c' is inserted after c_j and new dt_rem(c_(j+1)) tanimura> > and dt_rem(c_(j+2)) are determined. Now we can acquire_timer0() with dt_rem(c_0). tanimura> tanimura> If t' is less than dt_rem(c_0) then we have no feasible j. This is the case tanimura> in which we must reaquire_timer0() using t'. Then, after interting c', dt_rem(c_1) tanimura> is updated to be (dt_rem(c_1) - (time elapsed since the last aquire_timer0())), tanimura> so that c_1 can be armed later. Seigo Tanimura <tanim...@naklab.dnj.ynu.ac.jp> To Unsubscribe: send mail to majord...@freebsd.org with "unsubscribe freebsd-hackers" in the body of the message
